The problem with duplicate Buildings GameObject is fixed.

Test A :
- the Online Maps Buildings component is enabled before launching app
- i launch the app
- i disable the Online Maps Buildings component via code directly in a Start() method
- later i will enabled the component via code
-the buildings appears correctly
- i disable the component again
- the buildings does disappear
- after half a second the buildings are back in the scene.

Test B:
- the Online Maps Buildings component is disabled before launching app
- i launch the app
- later i will enabled the component via code
-the buildings appears correctly
- i disable the component again
- the buildings does disappear, and they don't come back until i enable the component again

The reason i was going for test A is that i was trying to enable / disable the component by doing :

public void use_Buildings(bool b)
{
     OnlineMapsBuildings.instance.enabled = b;
}

And this throw an error since the onlineMapsBuildings instance does'nt exist yet if i launch the app without it being enabled.

using this :

public void use_Buildings(bool b)
{
     OnlineMaps.instance.GetComponent<OnlineMapsBuildings>().enabled = b;
}

Allow me to do "test B" and so my problem is solved.

Note that in both case, a new gameobject named "buildings" (which become the parent of all the buildins) is created each time i enable the component.

Hope this feedback is usefull

To disable buildings, you just need to disable Online Maps Buildings component.
I just checked it and it works correctly.

What i want to achieve is basically being able to activate / disable the buildings at runtime.

I tried to disable the OnlineMapsBuildings script of the map but it does'nt get rid of the buildings.

i tryed to delete manually the buildings with

foreach (OnlineMapsBuildingBase item in OnlineMapsBuildings.instance.buildings.Values)
{
      Destroy(item.gameObject);
}

But they keep coming back !

Is there a way to achieve this ?